Question

How to solve this question

Answer 1

First distribute
7x + 21 = 6 + 7x + 15

Cancel equal terms
7x + 21 = 21 + 7x
-7x -7x

Then you’ll get
21=21


So the statement is true

Answer 2

7(x + 3 ) = 6 - (-7x - 15)

Apply the distributive rule to remove parentheses.

7x + 21 = 6 + 7x + 15

Right away, you should be able to see that 7x will be cancelled rendering this equation to have no solution.

Answer: NO SOLUTION